Telegraphic transmitter.



No. 692,967. Patented Fab. 1902.

C. E'. YETMAN. y TELEGRAPHIC TRANSMITTER.

(Application led Feb. 8. 1901.) (No Model.) 6 Sheets-Sheet I.

No'. 992,967. Patented Feb. n, |902.

c. E. YETMAN. .TELEGRAPHIC TRANSIMTTER.

(Applicgtion led Fah, 1901.)

6 Sheets-Sheet 2.

(N0 Model.)

No.-692,967. Patented Feb. H, |902. C. E.. YETMAN.

TELEGRAPHIGTRANSMITTER.

(Application led Feb. 8, 1901.)

*ma Model.) s sheets-sheet s.

'ma non ms :trans sa. Haro-pmol. wAsrnNcTon. n. c.

lo. 692,967. Patentedren. |902.; c. E. YETMAN. l

'TELEGRAPHIG TRANSMITTER.

(Application 4ild Feb. B, 1901.) 4

6 Sheets- Sheet 4.'

(No Model.)

mww

co.. PHOTO-nwo., msm

N0. 692,967. C. E. YETMAN.

' TELEGBAPHIC TRANSMITTER.

(Applicatiop led Feb. B, 1901.)

Patented Fab. n, i902'.l

(No Model.) 6 Sheets-Sheet 5.

IN Il m. 692,967. Patented Feb. n, |902.

c. E, YETMAN;

TELEGBPHIC TRANSMITTER.`

- (Applicatiun med Feb. s, 1901.) I

(No Model.) 6.Sheets-Sheet 6.

El i :ummmml- FME.

CHARLES E. YETMAN, OF OAKPARK, ILLNOIS.

TELEG RAPHIC TRANSlVllTTER.

-SPEGEFIGATION formingpart of Letters Patent No. 692,967, dated February1 1, 1902.

Application liled February 8, 1901.

T0 all 1071/077?, it Iii/(ty con/cern:

Beit known that l, CHARLES E. YETMAN, of Oakpark, Cook county, Illinois,have invented certain new and useful Improvements in TelegraphicTransmitters, of which the following is hereby declared to be a full,clear, and exact description.

My invention relates to improvements in electric code-transmitters ofthe type which are operated by finger-keys similar to those of anordinary type-writer and such as are disclosed in my United StatesLetters Patent No. 534,025, dated February 12, 1895, and moreparticularly to such transmitters as are combined with a type-writer theoperation of which is governed from the same keys, such as are disclosedin my United States Letters Patent No. 565,128, dated August 4, 1896.

The details of the preferred form of the device are set forth in thefollowing description and illustrated in the accompanying drawings, andthe invention is particularly pointed out byclaims at the end of thespeciticatiou.

In the drawings, Figure 1 is a longitudinal section through the combinedtype-writer and transmitter from front to rea-r, one key-lever and theattached parts being shown in full lines. Figs. 1fL and 1b are detailviews of a part of the operating mechanism shown in diferent positions.Fig. 2 is a partial v horizontal section on line 2 2 of Fig. 1 lookingin the direction of the arrow and illustrating the details of thetransmitter. Fig. 3 is a vertical detail sectionalv view through thefront part of the machine, showing the connectors between the nger-keysand the switch-shifters of the transmitter. Fig. 4 is asectional view ofthe transmitter, looking in the direction of the arrow, on line 4 4 ofFig. 2. Fig. 5 is a sectional View, looking in the direction ofthearrow, on line 5 5 of Fig. 2. Figs. 6 and 7 are detail views of one ofthe switch-Shifters of the transmitter. Figs. S and 9 are sectionalviews, looking in the direction of the arrow, on lines 8 8 and 9 9 ofFig.^4, respectively, with the central portion omitted. Figs. 10 and l1are front and rear elevations, respectively, of the transmitter withcertain portions omitted. Fig. 12 is a sectional view, looking in thedirection of the arrow, on lines 12 12 of Fig. 2.

The drawings illustrate the invention as Serial No. 46,580. (No model.)

applied to a style of sight type-writer such as is disclosed in myapplications for Letters Patent filed by me in the United States PatentOffice September 26, 1900, Serial Nos. 31,198 and 31,199; but it will beunderstood that the improvements are not confined to this particularstyle and can be applied to various forms of type-Writers withoutessential departure from the invention.

The base-frame 10 is of the usual rectangular form and is furnished Withrubber plugs or feet 11, upon which the machine rests. Upon the base aremounted the plate l2 and the upper portion 13. This upper portionsustainsthe carriage grooved tracks 14 and 15, which, by means of thegrooved rails 16 and 17 and balls 18, support the paper-carriage 19.Suitably j ou rnaled on the paper-carriage is the platen y2O. Thecarriage and paperfeed mechanisms form no part of the present inventionand are not shown or described. A semicircular stepped support 21,secured to the frontof the upper portion 13, serves as a mount for thetype-bars 22, set in circular range about the same and pivoted tovthsseparate lugs 23 therefor. The rest-pad 24 forthe type-bars is carriedby a support 25, secured to the plate 12. Links 26 are pivoted to andextend below the type-bars 22 and connect the latterto the key-action.The finger-keys 27 are of the usual lever form and are arranged inregular series or banks across the front of the machine and extend backin parallel relation to the fulcrum-ledge 28, which is suitably securedto a strip 29, extending across the frame 10. The key-levers areprovided with upwardly-projectin g offsets 30, between Which and thestrip 29 extend the springs 31 to hold the levers in their normaluplifted position in readiness to be struck by the operator. universalbar are also fulcrumed on the ledge 28, land the universal bar isarranged to operate a suitable escapement (not shown) for thepaper-carriage. A buffer 34 is arranged across the machine above thekey-levers, against which the latter strike when released.

Interposed between the key-levers and the The usual space-bar 32 and IOOserve to actuate both the bars of'the typewriter and the switch-Shiftersof the transmitter. Although 'these devices are frequently used inunison, by which means a verifying copy of the message transmitted willbe written, yet occasions frequently arise when it is desirable tooperate either the transmitter or the type-writer separately or to throweither or both devices ont of operation-as, for example, when theoperator temporarily leaves his Work-so that the machine will notrespond to accidental or mischievous operation of the linger-keys. Forthese reasons a series of supplemental levers are interposed between thekey-levers 27 and the links 26. The levers are pivoted on thefnlernm-bars 37 and 38, are pivotally connected at their upper ends tothe links 26 of the typebars 27, and are provided withlaterally-projecting pins 39, which are engaged in slots or seats in theupper part of offsets 30. Itis obvious that if the supplemental bars beraised so that the pins 39 will clear these slots or seats, then thedepression of the key-levers will produce no movement of thesupplemental levers or of the type-bars. I prefer to einploy themechanism next to be described for eec'ting this result.

Through the frame 10 extends a shaft 40, provided on its outer end withan operatinghandle and inside the frame with cranks 42,-

which are connected by links 43 with toggles 44. One end of toggles 44is pivoted to thel fnlcrnm-bar 37 and the other to the depend-v ingbrackets secured to bar 2S. The pivotbars 37 and 38 are connectedtogether by suitable bolts 45, that pass through guidesleeves 46,mounted in thecentral pivot-bar 28. In Figs. l and 1b the parts areshown in normal position, with the pivot-pins 39 in engagement With theseats on offsets 30. If, however, the parts are shifted by shaft into'the position shown in Fig. 1", the pivot-bars 37 and 38 and supplementallevers 35 will be` bodily moved to the pins 39 from engagement with theoffsets 30 and the type-.bars will not respond to the play of thekey-levers 27. By reference to Fig. lb it will be seen that the toggles44 are shifted slightly beyond the line of centers, so that they serveto temporarily hold the pivot-bars and supplementary levers in raisedposition.

Toward the front of the machine each keylever 27 carries pivotedthereto, as at 47, a connector 48, having a side pin 49, designed toencounter the toe of the switch appliance or shifter F, extending intothe path Ithereof. are provided with slots 5l, all of which are engagedby a throw-off 52, which consists of a transverse metal rod and slidingcombbar 52, sustained at its ends by cranks 53,

mounted on trunnion-shaft 54, whereby the vthrow-off may be shifted tobring the studs 49 into or ont of range with the toes ofthe parallelseries of Shifters F on the transmitter. On one end of the shaft 54,which extends The parallel set of connectors 48' through the side of themachine, is secured v the actuating-handle 55. Acam-spring 56 is securedto the side of frame 10 and is provided With an angular cam-surface 57,which engages a similar cam-surface 58 on an arm 59, secured to shaft54. The operator will operate the handle to move the parts until thepoint of the angular cam-surface 58 is passed beneath that ofcam-surface 57 which cam-surfaces Will then operate to force and lockthe parts either into or out of the'operative position.

Secured inside lof the frame l0 by means of-screws 60 passing throughbosses 61 are the side frame-pieces A A of the transmitter, which isthus free to be attached to or detached from the type-writer proper, asdesired.` The side pieces A A are preferably of insulating material-e.g., vulcanized fiberand in suitable recesses therein are located thehub-boxes a of the tinted shaft B. Shaft B extends across the machineand affords a mount for the set of switch appliances such as arerequisite to transmit a complete system of conventional code-signals. Atone end (see Figs. 2 and 8) the shaft B carries a pinionb, usually ofvulcanized ber, and which engages with the gear-train (not shown) of asuitable motor designed to drive the shaft at uniform speed. I

A series of shifters F in the form of levers and designed to control thediversion of the electric current through any of the several switches orsymbol-disks appropriate to the individual signals in the code system ismounted in parallel array near the lower part of the transmitter-frame.The several shifters are pivoted to the comb-bar 62, secured at the rearto the side frame-pieces A Af, and extend through thedownwardly-projecting teeth 63 ofthe bar 64, secured to the front of thetrans= mitter-frame. By the teeth 63 the free ends of the switch leversor Shifters are held in position and have a limited play between thebuffer-strips and 66 of the transverse bars 64 and 67, respectively.Springs 68 extend between the Shifters F and the transverse bar 69 andhold the former in normal relation snugly against the bner-strip 65 andin position for stud-pin 49 on connector 4S to strike the toe 50 of theadjacent shifter F and depress the shifter against the stress of spring68 if the suitable key-lever be brought into play.

0n the rotating driver B is mounted the ,Series of symbol disks or'ringsE, the inner rims of which are tinted to engage at will with the iiuteddriver. On the outer rim of the several metal rings E are insulatoryblocks e at proper intervals. The insulation varies in keeping with theconventional signal for the letter, character, or word to be transmittedby the particular ring. The drawing Fig. 4 shows a ring designed to sendone dash and two dots, which by the Morse code signilies the letter D.Itis also apparent that the ring referred to has the signal dash anddots IOO IIO

repeated three times about its periphery. Space-pins e project from thering-rim between each signal set. These are preferably set ininsulating-plugs of rawhide and serve as trips to check the motion ofthe ring at the insulation-block on completion of the signal, aspresently set forth.

Ordinarily thecircuit-rings E stand disengaged from the driver B, butrest instead upon the Shifters, which are provided between their endswith a curved portion, to either side of which are secured strips 69 ofinsulating material-e. g., vulcanized fiber-which are of rounded contourto conform to the ringrim. In such shape the shif ters act as a brake toquickly arrest Vthe revolution of the ring on release from the driver.The strips 69 furnish a broad seat for the ring and proper clearance forthe space-pins e on the ring, which are convenientlyset on the medianline of the rim. In order to separate the rings, thin insulating-strip70 is secured in one side of each of the shifters, and its upper edge isstraight, so that the entire series of Shifters, with theinsulating-strips, forms a series of recesses in which the symbol-diskslrest and by which they are held apart. Under stress of the springs 68the shifters F generally stand in uplifted position and carry with themthe series of circuit-rings, which are thus free from the driver B anddo not revolve.

The transverse bar 64 is provided on its inner face with notches, inwhich are pivoted the upper members m of the togglelatches by means of acommon pivot-rod P2. The lower members m of the toggle-latches arepivoted to the members m and by a pin-andslot connection to the forwardends of the Shifters F. Coiled springs P are fastened to a common rodP', extend through openings in the bar 64, and are attached to themembers m of the toggle-latches. These toggle-latches are held in theirnormal flexed position (shown in Fig. l) by the upward pressure of theshifters under stress of the springs 68. When any particular shifter isdepressed, the toggles are straightened and drawn into a positionsomewhat beyond the line of centers by the springs P, (see Fig. 4,) sothat the shifter is locked in its depressed position. At the same timethe trip-pawl g", which is pivoted at the upper end of lever lm, dropsaccordingly against the face of the circuitringE and rests in the pathof the space-pins e. The descent of the shifter necessarily lowers thecircuit-ring E, which it controls, and brings such ring into engagementwith the rotating driver B. At once the circuitring begins to revolveand so persists for a distance sufficient to transmit the desiredsignal.

When the transmitter is in use, the electric circuit can be traced fromthe battery (not shown) by wire 7l and binding-post 72, Figs. 2 and l0,wire 73, to binding-post 73a., to the transverse metallic comb-bar 74,which is secured at the rear of the transmitter to the insulating sidewalls A A. The bar 74 carries aseries of contact-pieces u u', brought tobear lightly upon the several circuit-rings E. When the metal part ofthe vring makes contact with the contact-pieces "Lt u riding thereon,the circuit is closed thereby and may be traced further from the ring E,driver B, spring 75, pressed in contact at one end thereof, binding-post76, line-wire 77, binding-post 78, and line-wire 79 to the distantstation. To further insure the completion of the cir-V cuit,.a wire 8Oconnects the binding-post 76 with the metallic hub-box a of the driverB. The successive dots and dashes to complete the signal are produced bythe variations in lengths of the metallic parts of the ring hav.- ingthe insulation-blocks between them. As the signal is finished the nextspace-pin e' on the ring E encounters the trip-pawl g and forces itbackward, thereby rocking the upper member m of the toggle-latch untilits lower end has passed the line of centers. The shifter is then` freeto rise again to its normal position under stress of the spring 68, andin rising it lifts the circuit-ring E out of engagement with the shaftB, arrests its motion, and forces the toggle-latch back into its normalposition, while a lug or projection m2 on lever m engages the pawl g andraises it clear of the ring. The parts are thus all re'- turned to thenormal state in readiness to allow for transmission of the nextcharacter or, as may be requisite, to repeat the same character.

In order to insure that the trip-pawl g will' always drop into contactwith the ring E and to prevent it from being thrown back out of itsnormal position, the lever m is provided with a lug or projection m3similar to lug m2 above the trip-pawl g. Y

If multiple repetitions of the same character are desired, as in callinga distant station, this can be accomplished by holding the trippawl g'lout of action clear of the path of the space-pins on thel circuit-ringE. A transverse pivot-bar W, arranged at one side and above the rings,carries the ol'set rod @which will swing in the path of the series ofpawls g. The button 'y' is threaded onto the end of bar W and, extendingthrough one side of the machine-frame, Fig. 2, serves to turn said bar,and thus bring the offset rod fr; in position to prevent the pawls gfrom dropping into contact with the rings E. Hence when the selectedshifter is depressed and held down by its latch the individual pawl gpertaining to the toggle-latch must stay uplifted, by which expedientthe circuit-ring E continues to re- Volve on the driver B until the rodw is withdrawn at the will of the operator to allow the pawl g todescend and effect the release of the latch, shifter F, and ring E. Alockingcam 8l is located in a depression in the inner slde of theframe-piece A and is secured to the bar W. The movement of the rods WVand a; is limited by the stop-pin S2, secured to framepiece A andengaging a depression 83 in cam 8l. Cam Slis also provided with twoannufinger-keys of the keyboard would be uneven.

assigned position.

lar notches 83, adapted to be engaged by an angular projection 84 onspring 85, secured to frame-piece A, by which the bar W together withits cross-rod a; are held in their The contactpieces u a are arranged inpairs, both pieces of each pair engaging a single contact-ring. Betweeneach pair is a shoulder-pin u2, to which the contact-pieces are looselyconnected, light'spring's 86, extended between these pins and pins 87,connecting the insulating-pieces on the shifters F. One of each pair ofcontact-pieces has secured at its end a piece as, of insulatingmaterial, which projects downwardly to a slight extent between adjacentrings E and serves to space their upper edges apart. By providing twocontacting-pieces for each ring, which are to a slight degreeindependently movable, I insure that the contact between the pieces andthe metal parts of the rings will not be broken by the presence ofparticles of dust, &c. i

It will be seen that ring E, if the springs 86 were fastened to a ixedpart, would necessarily be raised against the pressure of these springs;but by securing them to the shifters F and arranging the parts so thatlittle pressure will be exerted by springs 68 in the normal positiontension will be placed upon these springs 86, when the particularshifter is depressed at just the time when such a ten sion is required;but as soon as the shifter'F'commences to ascend this tension isrelieved and the ring E is easily lifted by the stress of spring 68 onshifter F. For this reason the springs 68 may have comparatively littletension, and therefore since the keys act in opposition to these springsthe instrument will quickly respond to the operators touch.

V As clearly shown in Fig. l, the length of the iinger-keys varies fromthe shortest in the highest bank of keys to the longest in the lowestbank, while the connectorsare all pivoted to the linger-keys ata uniformdistance from the fulcrum. If, therefore, the contact-pins 49 are alllocated at the same distance from the pivots 47, it is evident that thedepression of the To remedy this difficulty, the distances from thepivots 47 to the contact-point between the connectors 48 and theShifters F is varied in proportion to the length of the levers byvarying the distance of the pins 49 from the pivots 47. By reference toFig. 3 it will be seen that these pins are located at four differentpoints 49, 49h, 49", and 49d, the connectors of the shortest key-levershaving pins located at 492L and those of the longest having pins locatedat 49d, Wh'ile the connectors of the levers'of intermediate lengths havecontactpins located at 49b and 49C. This arrangement will insure theproper actuation of the Shifters of the transmitter while allowing thesame extents of downward movement to the forward ends of the key-leversregardless of their length-7). e., it insures a uniformity of touch forthe keys. The same result could be accomplished by placing the pins 49at a uniform distance from the pivots 47 and placing lugs of varyingheights on the toes 50 of the shifters F.

Provision is made for the arrest of the rotating driver B and toestablish a short circuit around the machine. The end ring D of theseries of rings, Figs. 5 and 8, is entirelyof metal and is provided witha brake-surface 88, which is adapted to bear on the reduced portion 89of the driver B. The locking-ring D -is provided at its top with aprojecting lug 90,

to which are pivoted on either side the connecting-pieces 91, whicharelikewise pivoted to the transverse circuit-bar 74, The shifter F tocontrol the locking or short-circuit ring is mounted as usual and isprovided with a heavy spring 86, which forces the brake-surface 88 ofthe ring D against the reduced portion 89 of the, shaft B when theshifter F is erator to throw the connectors 48 out of operativeposition.

lt may be desirable to complete the linecircuit through the machinewithout stopping the rotation of the driver B or without throwing theconnector 48 out of operative position--as, for example, when theoperator is interrupted for a few seconds. For this purpose the studs 94and 95 are mounted in insulating-sockets 96 and 9 7 in the side of the vmachine and connected by wires 98 and 99 with the binding-posts 78 and72. Stud 94 is provided with the switch-lever 100, whichis adapted toengage the spring-contact surface.

lOl of stud 95.

- Obviously the details of my invention can ing thereto, of theconnectors extending from said finger-keys and engaging with saidshifters, the position of the points of engagement IIO between saidconnectors and Shifters varying in accordance with the varying lengthsof the corresponding finger-keys.

3. The combination with theindividual 1inger-keys of varying lengths andwith the series of transmitter switch-Shifters corresponding thereto, ofthe set of connectors extending between said keys and Shifters andhavingoffsets for engaging said Shifters, the location of said offsets npontheconnectors varying in accordance with the varying lengths of thecorresponding nger-keys.

4. The'combination with the individual finger-keys of varying lengthsand with the series of pivoted transmitter switch-Shifters correspondingthereto, of the set of connectors pivotedl to said finger-keys andprovided with offsets adapted to engage the free ends of said Shifters,the distances between the pivots and offsets of said connectors varyingin accordance with the varying lengths of the corresponding finger-keys.

5. The combination with the series of transmitter switch-Shifters, of aseries of individual finger-keys corresponding thereto and havingoperating connections therefor, and a set of toggle-latches for holdingsaid Shifters out of normal position when actuated by the finger-keys.

G. The combination with the individual fny ger-keys, and with the seriesof transmitter switch-Shifters corresponding thereto, of the set ofconnectors extending between said keys and Shifters, whereby saidshifters are depressed, and the set of latches for holding said shiftersdepressed, each of said latches consisting of toggle-levers one of whichis pivoted to a fixed part and the other to the appropriate shifter.,

7. The combination with the individual finger-keys and with the seriesof transmitter switch-Shifters corresponding thereto, of the set ofconnectors extending between said finger-keys and said Shifters, wherebythe latter are depressed, and the set of toggles extending between afixed part and said Shifters for holding the Shifters in the depressedposition.

S. The combination with the individual linger-keys and with the seriesof transmitter switch-Shifters corresponding thereto, of the set ofconnectors extending between said nger-keys and said Shifters foractuating said Shifters, the set of togggles extending between a xedpart and said Shifters, for holding the latter out of normal positionwhen actuated by the finger-keys, and trip-pawls for throwing saidtoggles to restore the selected shifters to their normal position.

9. The combination in an electric transmitter, with a series ofswitch-Shifters and with a rotating shaft having circuit make and breakdevices thereon, of a set of toggles engaging with said Shifters to holdthem depressed, trip-pawls carried thereby and projected by the descentof said Shifters into the path of said make and break devices, andengaging at intervals therewith to throw the separate toggles andrestore the Shifters to their normal position.

10. The combination, in an electric trans- 4mitter, with a series ofswitch-Shifters, of a set of latches engaging with said Shifters toAhold them depressed, trip pawls pivoted thereon and actuated bya movingpartof the device to throw said latches and restore the Shifters totheir normal position, and lugs on said latches engaging said pivotedtrip-pawls.

l1. The combination, in an electric transmitter, with a series ofswitch-Shifters and of a set of latches engaging with saidshifters tohold them depressed,trip-pawls pi voted thereon and actuatedpby a movingpart of the device to throw said latches and restore the Shifters totheir normal position, said latches being provided with lugs engagingsaid pivoted trip-pawls on either side.

12. The combination, in an electric transmitter, with the series ofspring pressed, switch-Shifters, of a set of spring-pressed togglesextending between a fixed part and said switch-Shifters to hold thelatter depressed, and means for throwing said toggles to restore theShifters to their normal position.

13. The combination with a rotating shaft, and with a Series of circuitmake and break rings thereon, of a set of Shifters for controlling Saidrings, a set of contact-pieces engaging said rings, and springsextending between said Shifters and Said contact-pieces.

14.. The combination with a series of movable contact-surfaces, of a setof Shifters controlling the movement of said surfaces, a set of brushesengaging said surfaces and springs between said brushes and saidShifters.

15. The combination with a rotating shaft, and with a series of circuitmake and break ringsthereon, of a set of Shifters for controlling saidrings, a pair of contact-pieces, loosely connected together engagingeach of Said rings, and springs between each pair of contact pieces andthe shifter corresponding thereto.

16. The combination with a rotating shaft and with a series of circuitmake and break rings thereon, of a set of shifter-s having curved seatsor depressions for supporting said rings, and insulating-strips Securedto Said Shifters on one side of said seats or depressions and extendingbetween the rings.

17. The combination with a rotating shaft and with a series of circuitmake and break rings thereon, of a set of contact-pieces engaging Saidrings, and insulating-strips secured to said contact-pieces andextending between said rings.

1S. The combination with a rotating shaft, and with a series of circuitmake and break IOO IIO

IZO

rings thereon, of a set of Shifters for controlling said rings, a set ofcontact-pieces engaging Said rings, and insulating-pieces securedV`v ofnger-keys, switch-Shifters and type-bars corresponding thereto, pivotedsupplemental levers operatively connected to said typebars, offsets onsaid finger-keys engaging said supplementary levers, a throw-utf commonto the fulcra of the supplementary levers to disengage them from saidoffsets, and connectors pivoted to said linger-keys and engaging saidswitch-Shifters.

20. The combination in a combined typewriter andtransmitter, of theindividual pivoted finger-keys, the series of type-bars and switch-Shifters, corresponding thereto, the set of pivoted supplemental leversconnected by links with said type-bars, offsets on said finger-keysprovided with notches engaging pins secured to said supplemental levers,connectors pivoted to said finger-keys and having offsets engaging saidswitch-Shifters, a throw-o common to the fnlcra of said supplementallevers for bodily moving the same to disengage said pins from saidnotches, and a second throw-olf common to said connectors to cast thesame at Will and free the Shifters from the keys.

21. The combination in a combined type- Writer and transmitter, of theindividual iinger-keys, the series of type-bars and switchshifterscorresponding thereto, the set of pivoted supplemental leversoperatively con- 3o

